The team 4 gripwalk children's ski binding is designed to offer very young skiers maximum lightness and comfort, making it easier to learn to ski safely.Its new heel piece makes it even easier to use. The team 4 gripwalk is compatible with the following junior and adult boot sole standards:- iso 5355 c- iso 5355 a- gripwalk junior future iso 23223 c - gripwalk adult future iso 23223 a